/* http://keith-wood.name/countdown.html
 Countdown for jQuery v1.6.3.
 Written by Keith Wood (kbwood{at}iinet.com.au) January 2008.
 Available under the MIT (https://github.com/jquery/jquery/blob/master/MIT-LICENSE.txt) license.
 Please attribute the author if you use it. */

/* Display a countdown timer.
 Attach it with options like:
 $('div selector').countdown(
 {until: new Date(2009, 1 - 1, 1, 0, 0, 0), onExpiry: happyNewYear}); */

(function ($) { // Hide scope, no $ conflict

    /* Countdown manager. */
    function Countdown() {
        this.regional = []; // Available regional settings, indexed by language code
        this.regional[''] = { // Default regional settings
            // The display texts for the counters
            labels: ['Years', 'Months', 'Weeks', 'Days', 'Hours', 'Minutes', 'Seconds'],
            // The display texts for the counters if only one
            labels1: ['Year', 'Month', 'Week', 'Day', 'Hour', 'Minute', 'Second'],
            compactLabels: ['y', 'm', 'w', 'd'], // The compact texts for the counters
            whichLabels: null, // Function to determine which labels to use
            digits: ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9'], // The digits to display
            timeSeparator: ':', // Separator for time periods
            isRTL: false // True for right-to-left languages, false for left-to-right
        };
        this._defaults = {
            until: null, // new Date(year, mth - 1, day, hr, min, sec) - date/time to count down to
            // or numeric for seconds offset, or string for unit offset(s):
            // 'Y' years, 'O' months, 'W' weeks, 'D' days, 'H' hours, 'M' minutes, 'S' seconds
            since: null, // new Date(year, mth - 1, day, hr, min, sec) - date/time to count up from
            // or numeric for seconds offset, or string for unit offset(s):
            // 'Y' years, 'O' months, 'W' weeks, 'D' days, 'H' hours, 'M' minutes, 'S' seconds
            timezone: null, // The timezone (hours or minutes from GMT) for the target times,
            // or null for client local
            serverSync: null, // A function to retrieve the current server time for synchronisation
            format: 'dHMS', // Format for display - upper case for always, lower case only if non-zero,
            // 'Y' years, 'O' months, 'W' weeks, 'D' days, 'H' hours, 'M' minutes, 'S' seconds
            layout: '', // Build your own layout for the countdown
            compact: false, // True to display in a compact format, false for an expanded one
            significant: 0, // The number of periods with values to show, zero for all
            description: '', // The description displayed for the countdown
            expiryUrl: '', // A URL to load upon expiry, replacing the current page
            expiryText: '', // Text to display upon expiry, replacing the countdown
            alwaysExpire: false, // True to trigger onExpiry even if never counted down
            onExpiry: null, // Callback when the countdown expires -
            // receives no parameters and 'this' is the containing division
            onTick: null, // Callback when the countdown is updated -
            // receives int[7] being the breakdown by period (based on format)
            // and 'this' is the containing division
            tickInterval: 1 // Interval (seconds) between onTick callbacks
        };
        $.extend(this._defaults, this.regional['']);
        this._serverSyncs = [];
        var now = (typeof Date.now == 'function' ? Date.now :
            function () {
                return new Date().getTime();
            });
        var perfAvail = (window.performance && typeof window.performance.now == 'function');
        // Shared timer for all countdowns
        function timerCallBack(timestamp) {
            var drawStart = (timestamp < 1e12 ? // New HTML5 high resolution timer
                (perfAvail ? (performance.now() + performance.timing.navigationStart) : now()) :
                // Integer milliseconds since unix epoch
                timestamp || now());
            if (drawStart - animationStartTime >= 1000) {
                plugin._updateTargets();
                animationStartTime = drawStart;
            }
            requestAnimationFrame(timerCallBack);
        }

        var requestAnimationFrame = window.requestAnimationFrame ||
            window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame ||
            window.oRequestAnimationFrame || window.msRequestAnimationFrame || null;
        // This is when we expect a fall-back to setInterval as it's much more fluid
        var animationStartTime = 0;
        if (!requestAnimationFrame || $.noRequestAnimationFrame) {
            $.noRequestAnimationFrame = null;
            setInterval(function () {
                plugin._updateTargets();
            }, 980); // Fall back to good old setInterval
        }
        else {
            animationStartTime = window.animationStartTime ||
                window.webkitAnimationStartTime || window.mozAnimationStartTime ||
                window.oAnimationStartTime || window.msAnimationStartTime || now();
            requestAnimationFrame(timerCallBack);
        }
    }

    var Y = 0; // Years
    var O = 1; // Months
    var W = 2; // Weeks
    var D = 3; // Days
    var H = 4; // Hours
    var M = 5; // Minutes
    var S = 6; // Seconds

    $.extend(Countdown.prototype, {
        /* Class name added to elements to indicate already configured with countdown. */
        markerClassName: 'hasCountdown',
        /* Name of the data property for instance settings. */
        propertyName: 'countdown',

        /* Class name for the right-to-left marker. */
        _rtlClass: 'countdown_rtl',
        /* Class name for the countdown section marker. */
        _sectionClass: 'countdown_section',
        /* Class name for the period amount marker. */
        _amountClass: 'countdown_amount',
        /* Class name for the countdown row marker. */
        _rowClass: 'countdown_row',
        /* Class name for the holding countdown marker. */
        _holdingClass: 'countdown_holding',
        /* Class name for the showing countdown marker. */
        _showClass: 'countdown_show',
        /* Class name for the description marker. */
        _descrClass: 'countdown_descr',

        /* List of currently active countdown targets. */
        _timerTargets: [],

        /* Override the default settings for all instances of the countdown widget.
         @param  options  (object) the new settings to use as defaults */
        setDefaults: function (options) {
            this._resetExtraLabels(this._defaults, options);
            $.extend(this._defaults, options || {});
        },

        /* Convert a date/time to UTC.
         @param  tz     (number) the hour or minute offset from GMT, e.g. +9, -360
         @param  year   (Date) the date/time in that timezone or
         (number) the year in that timezone
         @param  month  (number, optional) the month (0 - 11) (omit if year is a Date)
         @param  day    (number, optional) the day (omit if year is a Date)
         @param  hours  (number, optional) the hour (omit if year is a Date)
         @param  mins   (number, optional) the minute (omit if year is a Date)
         @param  secs   (number, optional) the second (omit if year is a Date)
         @param  ms     (number, optional) the millisecond (omit if year is a Date)
         @return  (Date) the equivalent UTC date/time */
        UTCDate: function (tz, year, month, day, hours, mins, secs, ms) {
            if (typeof year == 'object' && year.constructor == Date) {
                ms = year.getMilliseconds();
                secs = year.getSeconds();
                mins = year.getMinutes();
                hours = year.getHours();
                day = year.getDate();
                month = year.getMonth();
                year = year.getFullYear();
            }
            var d = new Date();
            d.setUTCFullYear(year);
            d.setUTCDate(1);
            d.setUTCMonth(month || 0);
            d.setUTCDate(day || 1);
            d.setUTCHours(hours || 0);
            d.setUTCMinutes((mins || 0) - (Math.abs(tz) < 30 ? tz * 60 : tz));
            d.setUTCSeconds(secs || 0);
            d.setUTCMilliseconds(ms || 0);
            return d;
        },

        /* Convert a set of periods into seconds.
         Averaged for months and years.
         @param  periods  (number[7]) the periods per year/month/week/day/hour/minute/second
         @return  (number) the corresponding number of seconds */
        periodsToSeconds: function (periods) {
            return periods[0] * 31557600 + periods[1] * 2629800 + periods[2] * 604800 +
                periods[3] * 86400 + periods[4] * 3600 + periods[5] * 60 + periods[6];
        },

        /* Attach the countdown widget to a div.
         @param  target   (element) the containing division
         @param  options  (object) the initial settings for the countdown */
        _attachPlugin: function (target, options) {
            target = $(target);
            if (target.hasClass(this.markerClassName)) {
                return;
            }
            var inst = {options: $.extend({}, this._defaults), _periods: [0, 0, 0, 0, 0, 0, 0]};
            target.addClass(this.markerClassName).data(this.propertyName, inst);
            this._optionPlugin(target, options);
        },

        /* Add a target to the list of active ones.
         @param  target  (element) the countdown target */
        _addTarget: function (target) {
            if (!this._hasTarget(target)) {
                this._timerTargets.push(target);
            }
        },

        /* See if a target is in the list of active ones.
         @param  target  (element) the countdown target
         @return  (boolean) true if present, false if not */
        _hasTarget: function (target) {
            return ($.inArray(target, this._timerTargets) > -1);
        },

        /* Remove a target from the list of active ones.
         @param  target  (element) the countdown target */
        _removeTarget: function (target) {
            this._timerTargets = $.map(this._timerTargets,
                function (value) {
                    return (value == target ? null : value);
                }); // delete entry
        },

        /* Update each active timer target. */
        _updateTargets: function () {
            for (var i = this._timerTargets.length - 1; i >= 0; i--) {
                this._updateCountdown(this._timerTargets[i]);
            }
        },

        /* Reconfigure the settings for a countdown div.
         @param  target   (element) the control to affect
         @param  options  (object) the new options for this instance or
         (string) an individual property name
         @param  value    (any) the individual property value (omit if options
         is an object or to retrieve the value of a setting)
         @return  (any) if retrieving a value */
        _optionPlugin: function (target, options, value) {
            target = $(target);
            var inst = target.data(this.propertyName);
            if (!options || (typeof options == 'string' && value == null)) { // Get option
                var name = options;
                options = (inst || {}).options;
                return (options && name ? options[name] : options);
            }

            if (!target.hasClass(this.markerClassName)) {
                return;
            }
            options = options || {};
            if (typeof options == 'string') {
                var name = options;
                options = {};
                options[name] = value;
            }
            if (options.layout) {
                options.layout = options.layout.replace(/&lt;/g, '<').replace(/&gt;/g, '>');
            }
            this._resetExtraLabels(inst.options, options);
            var timezoneChanged = (inst.options.timezone != options.timezone);
            $.extend(inst.options, options);
            this._adjustSettings(target, inst,
                options.until != null || options.since != null || timezoneChanged);
            var now = new Date();
            if ((inst._since && inst._since < now) || (inst._until && inst._until > now)) {
                this._addTarget(target[0]);
            }
            this._updateCountdown(target, inst);
        },

        /* Redisplay the countdown with an updated display.
         @param  target  (jQuery) the containing division
         @param  inst    (object) the current settings for this instance */
        _updateCountdown: function (target, inst) {
            var $target = $(target);
            inst = inst || $target.data(this.propertyName);
            if (!inst) {
                return;
            }
            $target.html(this._generateHTML(inst)).toggleClass(this._rtlClass, inst.options.isRTL);
            if ($.isFunction(inst.options.onTick)) {
                var periods = inst._hold != 'lap' ? inst._periods :
                    this._calculatePeriods(inst, inst._show, inst.options.significant, new Date());
                if (inst.options.tickInterval == 1 ||
                    this.periodsToSeconds(periods) % inst.options.tickInterval == 0) {
                    inst.options.onTick.apply(target, [periods]);
                }
            }
            var expired = inst._hold != 'pause' &&
                (inst._since ? inst._now.getTime() < inst._since.getTime() :
                    inst._now.getTime() >= inst._until.getTime());
            if (expired && !inst._expiring) {
                inst._expiring = true;
                if (this._hasTarget(target) || inst.options.alwaysExpire) {
                    this._removeTarget(target);
                    if ($.isFunction(inst.options.onExpiry)) {
                        inst.options.onExpiry.apply(target, []);
                    }
                    if (inst.options.expiryText) {
                        var layout = inst.options.layout;
                        inst.options.layout = inst.options.expiryText;
                        this._updateCountdown(target, inst);
                        inst.options.layout = layout;
                    }
                    if (inst.options.expiryUrl) {
                        window.location = inst.options.expiryUrl;
                    }
                }
                inst._expiring = false;
            }
            else if (inst._hold == 'pause') {
                this._removeTarget(target);
            }
            $target.data(this.propertyName, inst);
        },

        /* Reset any extra labelsn and compactLabelsn entries if changing labels.
         @param  base     (object) the options to be updated
         @param  options  (object) the new option values */
        _resetExtraLabels: function (base, options) {
            var changingLabels = false;
            for (var n in options) {
                if (n != 'whichLabels' && n.match(/[Ll]abels/)) {
                    changingLabels = true;
                    break;
                }
            }
            if (changingLabels) {
                for (var n in base) { // Remove custom numbered labels
                    if (n.match(/[Ll]abels[02-9]|compactLabels1/)) {
                        base[n] = null;
                    }
                }
            }
        },

        /* Calculate interal settings for an instance.
         @param  target  (element) the containing division
         @param  inst    (object) the current settings for this instance
         @param  recalc  (boolean) true if until or since are set */
        _adjustSettings: function (target, inst, recalc) {
            var now;
            var serverOffset = 0;
            var serverEntry = null;
            for (var i = 0; i < this._serverSyncs.length; i++) {
                if (this._serverSyncs[i][0] == inst.options.serverSync) {
                    serverEntry = this._serverSyncs[i][1];
                    break;
                }
            }
            if (serverEntry != null) {
                serverOffset = (inst.options.serverSync ? serverEntry : 0);
                now = new Date();
            }
            else {
                var serverResult = ($.isFunction(inst.options.serverSync) ?
                    inst.options.serverSync.apply(target, []) : null);
                now = new Date();
                serverOffset = (serverResult ? now.getTime() - serverResult.getTime() : 0);
                this._serverSyncs.push([inst.options.serverSync, serverOffset]);
            }
            var timezone = inst.options.timezone;
            timezone = (timezone == null ? -now.getTimezoneOffset() : timezone);
            if (recalc || (!recalc && inst._until == null && inst._since == null)) {
                inst._since = inst.options.since;
                if (inst._since != null) {
                    inst._since = this.UTCDate(timezone, this._determineTime(inst._since, null));
                    if (inst._since && serverOffset) {
                        inst._since.setMilliseconds(inst._since.getMilliseconds() + serverOffset);
                    }
                }
                inst._until = this.UTCDate(timezone, this._determineTime(inst.options.until, now));
                if (serverOffset) {
                    inst._until.setMilliseconds(inst._until.getMilliseconds() + serverOffset);
                }
            }
            inst._show = this._determineShow(inst);
        },

        /* Remove the countdown widget from a div.
         @param  target  (element) the containing division */
        _destroyPlugin: function (target) {
            target = $(target);
            if (!target.hasClass(this.markerClassName)) {
                return;
            }
            this._removeTarget(target[0]);
            target.removeClass(this.markerClassName).empty().removeData(this.propertyName);
        },

        /* Pause a countdown widget at the current time.
         Stop it running but remember and display the current time.
         @param  target  (element) the containing division */
        _pausePlugin: function (target) {
            this._hold(target, 'pause');
        },

        /* Pause a countdown widget at the current time.
         Stop the display but keep the countdown running.
         @param  target  (element) the containing division */
        _lapPlugin: function (target) {
            this._hold(target, 'lap');
        },

        /* Resume a paused countdown widget.
         @param  target  (element) the containing division */
        _resumePlugin: function (target) {
            this._hold(target, null);
        },

        /* Pause or resume a countdown widget.
         @param  target  (element) the containing division
         @param  hold    (string) the new hold setting */
        _hold: function (target, hold) {
            var inst = $.data(target, this.propertyName);
            if (inst) {
                if (inst._hold == 'pause' && !hold) {
                    inst._periods = inst._savePeriods;
                    var sign = (inst._since ? '-' : '+');
                    inst[inst._since ? '_since' : '_until'] =
                        this._determineTime(sign + inst._periods[0] + 'y' +
                            sign + inst._periods[1] + 'o' + sign + inst._periods[2] + 'w' +
                            sign + inst._periods[3] + 'd' + sign + inst._periods[4] + 'h' +
                            sign + inst._periods[5] + 'm' + sign + inst._periods[6] + 's');
                    this._addTarget(target);
                }
                inst._hold = hold;
                inst._savePeriods = (hold == 'pause' ? inst._periods : null);
                $.data(target, this.propertyName, inst);
                this._updateCountdown(target, inst);
            }
        },

        /* Return the current time periods.
         @param  target  (element) the containing division
         @return  (number[7]) the current periods for the countdown */
        _getTimesPlugin: function (target) {
            var inst = $.data(target, this.propertyName);
            return (!inst ? null : (inst._hold == 'pause' ? inst._savePeriods : (!inst._hold ? inst._periods :
                this._calculatePeriods(inst, inst._show, inst.options.significant, new Date()))));
        },

        /* A time may be specified as an exact value or a relative one.
         @param  setting      (string or number or Date) - the date/time value
         as a relative or absolute value
         @param  defaultTime  (Date) the date/time to use if no other is supplied
         @return  (Date) the corresponding date/time */
        _determineTime: function (setting, defaultTime) {
            var offsetNumeric = function (offset) { // e.g. +300, -2
                var time = new Date();
                time.setTime(time.getTime() + offset * 1000);
                return time;
            };
            var offsetString = function (offset) { // e.g. '+2d', '-4w', '+3h +30m'
                offset = offset.toLowerCase();
                var time = new Date();
                var year = time.getFullYear();
                var month = time.getMonth();
                var day = time.getDate();
                var hour = time.getHours();
                var minute = time.getMinutes();
                var second = time.getSeconds();
                var pattern = /([+-]?[0-9]+)\s*(s|m|h|d|w|o|y)?/g;
                var matches = pattern.exec(offset);
                while (matches) {
                    switch (matches[2] || 's') {
                        case 's':
                            second += parseInt(matches[1], 10);
                            break;
                        case 'm':
                            minute += parseInt(matches[1], 10);
                            break;
                        case 'h':
                            hour += parseInt(matches[1], 10);
                            break;
                        case 'd':
                            day += parseInt(matches[1], 10);
                            break;
                        case 'w':
                            day += parseInt(matches[1], 10) * 7;
                            break;
                        case 'o':
                            month += parseInt(matches[1], 10);
                            day = Math.min(day, plugin._getDaysInMonth(year, month));
                            break;
                        case 'y':
                            year += parseInt(matches[1], 10);
                            day = Math.min(day, plugin._getDaysInMonth(year, month));
                            break;
                    }
                    matches = pattern.exec(offset);
                }
                return new Date(year, month, day, hour, minute, second, 0);
            };
            var time = (setting == null ? defaultTime :
                (typeof setting == 'string' ? offsetString(setting) :
                    (typeof setting == 'number' ? offsetNumeric(setting) : setting)));
            if (time) time.setMilliseconds(0);
            return time;
        },

        /* Determine the number of days in a month.
         @param  year   (number) the year
         @param  month  (number) the month
         @return  (number) the days in that month */
        _getDaysInMonth: function (year, month) {
            return 32 - new Date(year, month, 32).getDate();
        },

        /* Determine which set of labels should be used for an amount.
         @param  num  (number) the amount to be displayed
         @return  (number) the set of labels to be used for this amount */
        _normalLabels: function (num) {
            return num;
        },

        /* Generate the HTML to display the countdown widget.
         @param  inst  (object) the current settings for this instance
         @return  (string) the new HTML for the countdown display */
        _generateHTML: function (inst) {
            var self = this;
            // Determine what to show
            inst._periods = (inst._hold ? inst._periods :
                this._calculatePeriods(inst, inst._show, inst.options.significant, new Date()));
            // Show all 'asNeeded' after first non-zero value
            var shownNonZero = false;
            var showCount = 0;
            var sigCount = inst.options.significant;
            var show = $.extend({}, inst._show);
            for (var period = Y; period <= S; period++) {
                shownNonZero |= (inst._show[period] == '?' && inst._periods[period] > 0);
                show[period] = (inst._show[period] == '?' && !shownNonZero ? null : inst._show[period]);
                showCount += (show[period] ? 1 : 0);
                sigCount -= (inst._periods[period] > 0 ? 1 : 0);
            }
            var showSignificant = [false, false, false, false, false, false, false];
            for (var period = S; period >= Y; period--) { // Determine significant periods
                if (inst._show[period]) {
                    if (inst._periods[period]) {
                        showSignificant[period] = true;
                    }
                    else {
                        showSignificant[period] = sigCount > 0;
                        sigCount--;
                    }
                }
            }
            var labels = (inst.options.compact ? inst.options.compactLabels : inst.options.labels);
            var whichLabels = inst.options.whichLabels || this._normalLabels;
            var showCompact = function (period) {
                var labelsNum = inst.options['compactLabels' + whichLabels(inst._periods[period])];
                return (show[period] ? self._translateDigits(inst, inst._periods[period]) +
                    (labelsNum ? labelsNum[period] : labels[period]) + ' ' : '');
            };
            var showFull = function (period) {
                var labelsNum = inst.options['labels' + whichLabels(inst._periods[period])];
                return ((!inst.options.significant && show[period]) ||
                (inst.options.significant && showSignificant[period]) ?
                    '<span class="' + plugin._sectionClass + '">' +
                    '<span class="' + plugin._amountClass + '">' +
                    self._translateDigits(inst, inst._periods[period]) + '</span><br/>' +
                    (labelsNum ? labelsNum[period] : labels[period]) + '</span>' : '');
            };
            return (inst.options.layout ? this._buildLayout(inst, show, inst.options.layout,
                inst.options.compact, inst.options.significant, showSignificant) :
                ((inst.options.compact ? // Compact version
                    '<span class="' + this._rowClass + ' ' + this._amountClass +
                    (inst._hold ? ' ' + this._holdingClass : '') + '">' +
                    showCompact(Y) + showCompact(O) + showCompact(W) + showCompact(D) +
                    (show[H] ? this._minDigits(inst, inst._periods[H], 2) : '') +
                    (show[M] ? (show[H] ? inst.options.timeSeparator : '') +
                        this._minDigits(inst, inst._periods[M], 2) : '') +
                    (show[S] ? (show[H] || show[M] ? inst.options.timeSeparator : '') +
                        this._minDigits(inst, inst._periods[S], 2) : '') :
                    // Full version
                    '<span class="' + this._rowClass + ' ' + this._showClass + (inst.options.significant || showCount) +
                    (inst._hold ? ' ' + this._holdingClass : '') + '">' +
                    showFull(Y) + showFull(O) + showFull(W) + showFull(D) +
                    showFull(H) + showFull(M) + showFull(S)) + '</span>' +
                (inst.options.description ? '<span class="' + this._rowClass + ' ' + this._descrClass + '">' +
                    inst.options.description + '</span>' : '')));
        },

        /* Construct a custom layout.
         @param  inst             (object) the current settings for this instance
         @param  show             (string[7]) flags indicating which periods are requested
         @param  layout           (string) the customised layout
         @param  compact          (boolean) true if using compact labels
         @param  significant      (number) the number of periods with values to show, zero for all
         @param  showSignificant  (boolean[7]) other periods to show for significance
         @return  (string) the custom HTML */
        _buildLayout: function (inst, show, layout, compact, significant, showSignificant) {
            var labels = inst.options[compact ? 'compactLabels' : 'labels'];
            var whichLabels = inst.options.whichLabels || this._normalLabels;
            var labelFor = function (index) {
                return (inst.options[(compact ? 'compactLabels' : 'labels') +
                whichLabels(inst._periods[index])] || labels)[index];
            };
            var digit = function (value, position) {
                return inst.options.digits[Math.floor(value / position) % 10];
            };
            var subs = {
                desc: inst.options.description, sep: inst.options.timeSeparator,
                yl: labelFor(Y), yn: this._minDigits(inst, inst._periods[Y], 1),
                ynn: this._minDigits(inst, inst._periods[Y], 2),
                ynnn: this._minDigits(inst, inst._periods[Y], 3), y1: digit(inst._periods[Y], 1),
                y10: digit(inst._periods[Y], 10), y100: digit(inst._periods[Y], 100),
                y1000: digit(inst._periods[Y], 1000),
                ol: labelFor(O), on: this._minDigits(inst, inst._periods[O], 1),
                onn: this._minDigits(inst, inst._periods[O], 2),
                onnn: this._minDigits(inst, inst._periods[O], 3), o1: digit(inst._periods[O], 1),
                o10: digit(inst._periods[O], 10), o100: digit(inst._periods[O], 100),
                o1000: digit(inst._periods[O], 1000),
                wl: labelFor(W), wn: this._minDigits(inst, inst._periods[W], 1),
                wnn: this._minDigits(inst, inst._periods[W], 2),
                wnnn: this._minDigits(inst, inst._periods[W], 3), w1: digit(inst._periods[W], 1),
                w10: digit(inst._periods[W], 10), w100: digit(inst._periods[W], 100),
                w1000: digit(inst._periods[W], 1000),
                dl: labelFor(D), dn: this._minDigits(inst, inst._periods[D], 1),
                dnn: this._minDigits(inst, inst._periods[D], 2),
                dnnn: this._minDigits(inst, inst._periods[D], 3), d1: digit(inst._periods[D], 1),
                d10: digit(inst._periods[D], 10), d100: digit(inst._periods[D], 100),
                d1000: digit(inst._periods[D], 1000),
                hl: labelFor(H), hn: this._minDigits(inst, inst._periods[H], 1),
                hnn: this._minDigits(inst, inst._periods[H], 2),
                hnnn: this._minDigits(inst, inst._periods[H], 3), h1: digit(inst._periods[H], 1),
                h10: digit(inst._periods[H], 10), h100: digit(inst._periods[H], 100),
                h1000: digit(inst._periods[H], 1000),
                ml: labelFor(M), mn: this._minDigits(inst, inst._periods[M], 1),
                mnn: this._minDigits(inst, inst._periods[M], 2),
                mnnn: this._minDigits(inst, inst._periods[M], 3), m1: digit(inst._periods[M], 1),
                m10: digit(inst._periods[M], 10), m100: digit(inst._periods[M], 100),
                m1000: digit(inst._periods[M], 1000),
                sl: labelFor(S), sn: this._minDigits(inst, inst._periods[S], 1),
                snn: this._minDigits(inst, inst._periods[S], 2),
                snnn: this._minDigits(inst, inst._periods[S], 3), s1: digit(inst._periods[S], 1),
                s10: digit(inst._periods[S], 10), s100: digit(inst._periods[S], 100),
                s1000: digit(inst._periods[S], 1000)
            };
            var html = layout;
            // Replace period containers: {p<}...{p>}
            for (var i = Y; i <= S; i++) {
                var period = 'yowdhms'.charAt(i);
                var re = new RegExp('\\{' + period + '<\\}([\\s\\S]*)\\{' + period + '>\\}', 'g');
                html = html.replace(re, ((!significant && show[i]) ||
                (significant && showSignificant[i]) ? '$1' : ''));
            }
            // Replace period values: {pn}
            $.each(subs, function (n, v) {
                var re = new RegExp('\\{' + n + '\\}', 'g');
                html = html.replace(re, v);
            });
            return html;
        },

        /* Ensure a numeric value has at least n digits for display.
         @param  inst   (object) the current settings for this instance
         @param  value  (number) the value to display
         @param  len    (number) the minimum length
         @return  (string) the display text */
        _minDigits: function (inst, value, len) {
            value = '' + value;
            if (value.length >= len) {
                return this._translateDigits(inst, value);
            }
            value = '0000000000' + value;
            return this._translateDigits(inst, value.substr(value.length - len));
        },

        /* Translate digits into other representations.
         @param  inst   (object) the current settings for this instance
         @param  value  (string) the text to translate
         @return  (string) the translated text */
        _translateDigits: function (inst, value) {
            return ('' + value).replace(/[0-9]/g, function (digit) {
                return inst.options.digits[digit];
            });
        },

        /* Translate the format into flags for each period.
         @param  inst  (object) the current settings for this instance
         @return  (string[7]) flags indicating which periods are requested (?) or
         required (!) by year, month, week, day, hour, minute, second */
        _determineShow: function (inst) {
            var format = inst.options.format;
            var show = [];
            show[Y] = (format.match('y') ? '?' : (format.match('Y') ? '!' : null));
            show[O] = (format.match('o') ? '?' : (format.match('O') ? '!' : null));
            show[W] = (format.match('w') ? '?' : (format.match('W') ? '!' : null));
            show[D] = (format.match('d') ? '?' : (format.match('D') ? '!' : null));
            show[H] = (format.match('h') ? '?' : (format.match('H') ? '!' : null));
            show[M] = (format.match('m') ? '?' : (format.match('M') ? '!' : null));
            show[S] = (format.match('s') ? '?' : (format.match('S') ? '!' : null));
            return show;
        },

        /* Calculate the requested periods between now and the target time.
         @param  inst         (object) the current settings for this instance
         @param  show         (string[7]) flags indicating which periods are requested/required
         @param  significant  (number) the number of periods with values to show, zero for all
         @param  now          (Date) the current date and time
         @return  (number[7]) the current time periods (always positive)
         by year, month, week, day, hour, minute, second */
        _calculatePeriods: function (inst, show, significant, now) {
            // Find endpoints
            inst._now = now;
            inst._now.setMilliseconds(0);
            var until = new Date(inst._now.getTime());
            if (inst._since) {
                if (now.getTime() < inst._since.getTime()) {
                    inst._now = now = until;
                }
                else {
                    now = inst._since;
                }
            }
            else {
                until.setTime(inst._until.getTime());
                if (now.getTime() > inst._until.getTime()) {
                    inst._now = now = until;
                }
            }
            // Calculate differences by period
            var periods = [0, 0, 0, 0, 0, 0, 0];
            if (show[Y] || show[O]) {
                // Treat end of months as the same
                var lastNow = plugin._getDaysInMonth(now.getFullYear(), now.getMonth());
                var lastUntil = plugin._getDaysInMonth(until.getFullYear(), until.getMonth());
                var sameDay = (until.getDate() == now.getDate() ||
                (until.getDate() >= Math.min(lastNow, lastUntil) &&
                now.getDate() >= Math.min(lastNow, lastUntil)));
                var getSecs = function (date) {
                    return (date.getHours() * 60 + date.getMinutes()) * 60 + date.getSeconds();
                };
                var months = Math.max(0,
                    (until.getFullYear() - now.getFullYear()) * 12 + until.getMonth() - now.getMonth() +
                    ((until.getDate() < now.getDate() && !sameDay) ||
                    (sameDay && getSecs(until) < getSecs(now)) ? -1 : 0));
                periods[Y] = (show[Y] ? Math.floor(months / 12) : 0);
                periods[O] = (show[O] ? months - periods[Y] * 12 : 0);
                // Adjust for months difference and end of month if necessary
                now = new Date(now.getTime());
                var wasLastDay = (now.getDate() == lastNow);
                var lastDay = plugin._getDaysInMonth(now.getFullYear() + periods[Y],
                    now.getMonth() + periods[O]);
                if (now.getDate() > lastDay) {
                    now.setDate(lastDay);
                }
                now.setFullYear(now.getFullYear() + periods[Y]);
                now.setMonth(now.getMonth() + periods[O]);
                if (wasLastDay) {
                    now.setDate(lastDay);
                }
            }
            var diff = Math.floor((until.getTime() - now.getTime()) / 1000);
            var extractPeriod = function (period, numSecs) {
                periods[period] = (show[period] ? Math.floor(diff / numSecs) : 0);
                diff -= periods[period] * numSecs;
            };
            extractPeriod(W, 604800);
            extractPeriod(D, 86400);
            extractPeriod(H, 3600);
            extractPeriod(M, 60);
            extractPeriod(S, 1);
            if (diff > 0 && !inst._since) { // Round up if left overs
                var multiplier = [1, 12, 4.3482, 7, 24, 60, 60];
                var lastShown = S;
                var max = 1;
                for (var period = S; period >= Y; period--) {
                    if (show[period]) {
                        if (periods[lastShown] >= max) {
                            periods[lastShown] = 0;
                            diff = 1;
                        }
                        if (diff > 0) {
                            periods[period]++;
                            diff = 0;
                            lastShown = period;
                            max = 1;
                        }
                    }
                    max *= multiplier[period];
                }
            }
            if (significant) { // Zero out insignificant periods
                for (var period = Y; period <= S; period++) {
                    if (significant && periods[period]) {
                        significant--;
                    }
                    else if (!significant) {
                        periods[period] = 0;
                    }
                }
            }
            return periods;
        }
    });

// The list of commands that return values and don't permit chaining
    var getters = ['getTimes'];

    /* Determine whether a command is a getter and doesn't permit chaining.
     @param  command    (string, optional) the command to run
     @param  otherArgs  ([], optional) any other arguments for the command
     @return  true if the command is a getter, false if not */
    function isNotChained(command, otherArgs) {
        if (command == 'option' && (otherArgs.length == 0 ||
            (otherArgs.length == 1 && typeof otherArgs[0] == 'string'))) {
            return true;
        }
        return $.inArray(command, getters) > -1;
    }

    /* Process the countdown functionality for a jQuery selection.
     @param  options  (object) the new settings to use for these instances (optional) or
     (string) the command to run (optional)
     @return  (jQuery) for chaining further calls or
     (any) getter value */
    $.fn.countdown = function (options) {
        var otherArgs = Array.prototype.slice.call(arguments, 1);
        if (isNotChained(options, otherArgs)) {
            return plugin['_' + options + 'Plugin'].apply(plugin, [this[0]].concat(otherArgs));
        }
        return this.each(function () {
            if (typeof options == 'string') {
                if (!plugin['_' + options + 'Plugin']) {
                    throw 'Unknown command: ' + options;
                }
                plugin['_' + options + 'Plugin'].apply(plugin, [this].concat(otherArgs));
            }
            else {
                plugin._attachPlugin(this, options || {});
            }
        });
    };

    /* Initialise the countdown functionality. */
    var plugin = $.countdown = new Countdown(); // Singleton instance

})(jQuery);
